# physics

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a 75 kg person escapes from a burning building by jumping from a window 30 m above a catching net. Acceleration due to gravity is 9.81 m/s^2. Assuming air resistance is simply a constant 96 N force on the person during the fall, determine the person's velocity just before hitting the net. answer in m/s.

• physics -

so Fg = 75*9.81 = 735.75 N

Fnet = ma

Fair - Fg = ma
96 - 735.75 = 75 * a
a = -8.53 m/s2

Vf2 = Vo2 +2ax
Vf2 = 0 + 2(-8.53)(-30)
Vf2 = 511.8
Vf = -22.63 m/s //neg b/c downward direction

• physics -

DO NOT MAKE THE ANSWER NEGATIVE ^^^^^^^ This is velocity NOT speed

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